A. They are used to summarize area routes to other areas.
B. They are used in not-so-stubby areas to propagate external routes.
C. They are used to notify areas of the ASBR.
D. They are flooded to all areas except stub areas （external route）.
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A.00000
B.12345
C.23456
D.65000
E.99999
A. The Layer 2 multicast address of the destination node
B. The solicited node multicast address of the destination node
C. The Layer 2 address of the destination node based on the destination IPv6 address
D. The IPv6 address of the destination node based on the destination Layer 2 address
A.6to4
B.6over4
C.ISATAP
D.GRE
A.0.0.0.1
B.0.255.0.1
C.2001：DB8：：1
D.2001：DB8：ABCD：FEEF：：1
A.2001：DB8：：1 and 2001：DB8：：2
B.2001：DB8：：9 and 2001：DB8：：10
C.2001：DB8：：10 and 2001：DB8：：17
D.2001：DB8：：1 and 2001：DB8：：18
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